US B-1B bomber in exercise over Korea

The United States has flown a B-1B supersonic bomber over South Korea in part of a massive combined aerial exercise involving hundreds of warplanes, a clear warning after North Korea last week tested its biggest and most powerful missile yet.

South Korea's Joint Chiefs of Staff said the Guam-based bomber simulated land strikes at a military field near South Korea's eastern coast during a drill with US and South Korean fighter jets on Wednesday.

"Through the drill, the South Korean and US air forces displayed the allies' strong intent and ability to punish North Korea when threatened by nuclear weapons and missiles," the JCS said in a statement.

Flyovers of B-1Bs have become an increasingly familiar show of force to North Korea, which after three ICBM tests has clearly moved closer toward building a nuclear arsenal that could viably target the US mainland.

The five-day drills that began on Monday involve more than 200 aircraft, including six US F-22 and 18 F-35 stealth fighters.

North Korea hates such displays of American military might at close range and claimed through its state media on Tuesday that the "US imperialist war mongers' extremely reckless war hysteria" has put the region at risk of a nuclear war.

South Korea's military says the Hwasong-15 the North tested last week has the potential to strike targets as far away as 13,000 kilometres, which would put Washington within reach.

The test flight used an arched trajectory and the missile flew 950 kilometres before splashing down near Japan.

The North also tested a different intercontinental ballistic missile twice in July and conducted its most powerful nuclear test in September which it described as a detonation of a thermonuclear weapon designed for ICBMs.